1. U.S. Department of Transportation: Intelligent Vehicle Initiative 2002 annual report.
http://www.itsdocs.fhwa.dot.gov//JPODOCS/REPTS_TE//13821.pdf
2. The Ministry of Economy, Trade and Industry: Technological Strategy Map (2009),
http://www.meti.go.jp/policy/economy/gijutsu_kakushin/kenkyu_kaihatu/str2009/7_1.pdf
(in Japanese)
3. Wierwille, W.W., Ellsworth, L.A., Wreggit, S.S., Fairbanks, R.J., Kirn, C.L.: Research on Vehicle-Based Driver Status/Performance Monitoring; Development, Validation, and Refinement of Algorithms For Detection of Driver Drowsiness: National Highway Traffic Safety Administration Final Report, DOT HS 808 247 (1994)
4. Ishida, K., Ito, A., Kimura, T.: A Study of Feature Factors on Sleepy Expressions based on Observational Analysis of Facial Images. Transactions of Society of Automotive Engineers of Japan 39(3), 251–256 (2008) (in Japanese)
5. Eoh, H.J., Chou, M.K., Kim, S.H.: Electroencephalographic study of drowsiness in simulated driving with sleep deprivation. International Journal of Industrial Ergonomics 35, 307–320 (2005)